The area formula for a circle...

.... is half of the diameter squared times π

What step needs to happen when you are given a diameter of a circle and asked to find area?

Take half the diameter to find radius.

What step needs to happen when you are given radius and asked to find circumference?

Double the radius and multiply by π.

Radius is twice the diameter

False - it is half the diameter

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Chapter 11 Geometry Formulas

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Area formulas, circumference

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Questions 15

Answers

1
Area of a parallelogram
A=b⋅h
A= b + h
A=πh
A=1/2 b⋅h
2
Area of a trapezoid
A= πb1
A= h⋅ b1⋅b2
A=½⋅h⋅(b1 + b2)
A=πr2b1
3
The formula for area includes addition of bases
Circumference of a circle
Area of a parallelogram
Area of a semi-circle
Area of a trapezoid
4
A=½πr²
Circumference
Area of a circle
Area of a trapezoid
Area of a semi-circle
5
The unit of circumference is...
one of these is wrong
units (singular) because it is one dimensional
units (singular) because it is a distance
units squared
6
The area formula for a circle...
.... is half of the diameter squared times π
...is π times the diameter
..... is double the radius times π
... is π times the radius
7
What step needs to happen when you are given a diameter of a circle and asked to find area?
Double the diameter to find radius.
Nothing - just square the diameter
Nothing - just multiply the diameter times π
Take half the diameter to find radius.
8
What step needs to happen when you are given radius and asked to find circumference?
Just multiply radius times π.
Divide radius by 2 and multiply by π.
Double the radius and multiply by π.
Cannot be found.
9
π is....
None of these
Two of these
the ratio of circumference to diameter
3.141592653589793...
10
Circumference of a circle
One of these is wrong
C = 2πr
C = πd
C=2bh
11
Distance across a circle through the center
Diameter
Area
Circumference
Radius
12
A triangle is half of a parallelogram.
False - it is half of a pentagon
False - not related
True
False - it is double a parallelogram
13
Area is equal to half of the base times the height
Area of a parallelogram
Area of a semi-circle
Area of a triangle
Area of a trapezoid
14
Radius is twice the diameter
False - it is half the diameter
False - radius is the area squared
True
False - they aren't related
15
The units of area are...
units squared
miles
units (singular)
three dimensional

Chapter 11 Geometry Formulas Flashcards | StudBud